Overflow checking is a process by which the DataServer evaluates whether the value defined for a data type exceeds the data type's capacity. If the value is greater than the bit size defined for a data type, an error message occurs.

Beginning with OpenEdge Release 10.1B, all in-memory operations on INTEGER and INT64 data types are now 64-bit, promoting potential conflicts when data is exchanged between OpenEdge Release 10.1A and earlier OpenEdge clients, and 10.1B MS SQL Server DataServers. For example, if a networked 10.1B DataServer produces an INT64 data type that is sent to a pre-10.1B client, and the INT64 data type is mapped to a 32-bit data type that exceeds 32-bits of data storage, the MS SQL Server will detect an overflow condition and an error message appears on the client machine.